Reciprocating electric motor.



G. W. TREMAIN. RBUIPRQGATING ELECTRIC MOTOR.

APPLIUATION YILED AB.14,190B.

920,222, Patented May 4, 1909.

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F j /K M .tures limit?? CHA RLES W. TREMAN, CF CHICAGO, ILLINOIS RECPROCATING ELECTRIC MOTOR.

Specification of Letters Patent.

i Patented Mtv 4. 1 ene.

Applicaan flied April i4, 190s." serial No.142a943.

'To all whom. it may concern:

Be it' known' 'that l, (iniiiLEs W. Tuin- MAIN,l a ctizen'oi the United States, residing 'at Chicago, inthe county of Cook and State 5v "of Illinois, have invented certain 'new and useful 'Improvements in Reciprocating Electric Motors, of which the following is a specicaiizori:

inventionr relates to a reciprocating electric motor and has for its object to irovide a"A `reciprocating electric motor which shall be suitable for use as a drill or a stamp, or in.other connections, and which shall have two reciprocating :'n'matures coupled together so as tdwork simultaneously in opposite directions.` .There are several advanta es in constructing an electroniagneticdril stamp or the like with two armaturr-zs coupled so as to work together. For example, one armature and the tool which it carr1esor operates is thus balanced against vthe other' armature and tool, so that the starting inertia at the tbe innin of each reci rocation is decreased an the iorce of the b ows capable of being better regulated than in the case of a single armature. Again, the use of two armatures or cores with` their corresponding magnets vincreases the' power of the motor. Furthermore, the movement in opposite directions of A the cores or the tilting movement ofthe coupling lever may be utilized for shifting the currents which -produce the magnetic pulls in op osite directions. But in stamps or drills,

an in other devices of this character, the

len th of stroke of the tool carrying part will,

un er practical working conditions, differ considerably. For example, in a stamp, the

length of the down stroke will vary according 40 t0 the hardness or the amount of the matcrial under the shoe. This circumstance interferes with a rigid coupling together of the armatures of a duplex electro-magnetic enirie used as a stam or the like and particuarly where the shiting of the currents from the coils producing the down stroke to those rducing the up-stroke, and vice versa, is to lpoe effectedy by the movements of the cores, or some parts Aassociated therewith.

One of the principal objects of my present invention `is to so couple the armatures of ,a duplexv reci rocatingfl electric motor that lthey will nworll"toga-t er but withouty the .shortening of the stroke of one of the arma- `thestrolre of the` other armayaccomplish byi providing the "ture:

lever, or other connecting means between the armatures, with a shifting fulcrum or other connection with the body ci the machine.

My invention has for further, objects such new and improved constructions, devices and arrangements in reciprocating electric morving armatures coupled together by a level' with a shifting fulcrum.

A is the battery of a stamp mill having two dies 1 and 2. i

B and represent the cores of a duplex electro-magnet which, as shown, consists of the coils E, F, G and H. Any number of coils might be used for each magnet. The cores B and C carry at their lower extremi ties the shoes 3 and 4,- res )ectively and their upper ends are connecte with a lever J by means of links 5 and 6, respectively.

The cores and coils are mounted in a casing K which ma f be supported in any desired manner on the attcry of the stamp. Preferably l provide means by which the position of this case may be adjusted vertically and may be supported elasticall j, the latter provision resulting in a mac line which works more smoothly and lasts longer than il the cores and coils were rigidly connected with the apparatus. To this end, l form the casing with the trunnions 7, which extend into sockets 9 formed upon sleeves 10 around the vertical supports 11. These arrangements are illustrated on the left side of the drawing. They will, of course, be duplicated at the other side of the machine. he support 11 as shown is screw threaded to receive an adjusting nut 12. The adjusting nut and the sleeve 10 are chambered so as to form seats for a spiral spring 13. Nut 14 above the sleeve holds the same in position. The swin ing of the casinghon the trunnions allows a s ight shifting of t e whole tool-carrying apparatus when the material under one or other of the shoes is uneven i` uahty. By giving the apparatus this httle .s1 e play' destructive jars and strains areavoldcd The lever J is fulcrumed on a vertical beam L which is pivpted at .1,5 to the casing K. The shifting of the fulcrum of Jl might be effected in numerous other ways. By

giving J a shifting fulcrum, of one sort or another, it will be seen that if the down stroke, for example, of one of the cores be shortened by an obstruction between its shoe and corresponding part, the other core will nevertheless complete its up stroke Thus, the force of the down stroke of the other core will not be lessened by a shortening of the stroke ol' its companion, nor the shifting of the currents when this is made dependent upon the completion oi the up strokes of the cores.

Each magnet ma r consist ol one or more coils. Preferably provide two coils for each core and connect the coils so that the upper and lower coils of each magnet are on the same circuit. In the drawing, M represents the fenerator, one of the main leads 16 of which as the branches 17 and 18 which connect with the contacts 1E) and 2U, respectively, onthe lever J', but insulated therefrom. These contacts come against the contact buttons 21 and 22, respectively, which are supported by springs 23, 24 in spring eases 25, 26, respectively. From button 21 a conductor 27 leads to coil G, coil G is connected with coil F by conductor 28, coil F with the other lead 29 of the generator M by conductor 30. Conductor 31 leads from the button 22 to coil E, conductor 32 from coil E to coil I I,` and conductor 33 from coil H to the main 29. The circuits and their connections with the motor have been illustrated diagrammatically. In ordinary practice the generator will be connected with the contacts 19 and 20 and contact buttons 21, 22 by some well known sort of device used for making -electrical connection between movable parts.

I Wish it to be understood that I do not desire to limit myself'to the particular devices, constructions and arrangements herein shown and described, as obvious modifications will occur to those skilled in the art which will come within the sco e of my invention. l have illustrated t e invention as embodied in a reciprocating electric motor used as a stamp. The invention might be utilized in many other connections; the provision of a motor having two coils coupled togethei' shifting connection with the body of the machine would be of value in any apparatus of this sort Where the strokes of the armatures were variable. 4

The use and operation of my apparatus is as follows: Sup ose material to be placed in the battery of tige stampv and the parts ofthe machine in the position shown in the drawing, current will pass from ,the generator over conductors 16 and 18, contact 20, contact button 22, conductor 31 lthro h coil E', over conductor 32, throu hcoil and, by conductors 33 and 29, bac to the generator.

by connecting means having ation they will be acted upon by the energize,-

tion respectively oi' the lower and upper coils through which they pass. If core C does not complete its intended stroke because, for example, of some obstructions or unusual amount of material on the die below it, the shifting ol the fulcrurn of J will never thelcss permit core C to com lete its up stroke. Thus the contact 19 wilpl be brought against contact button 21 at the proper time. By this time, of course, the separation of contacts 20 and. 22 will have shut oil' the current from E and H. The circuit from the generator may now be traced through G and F as follows: from the generator over conductors 16 and 17, contacts 19 and 21 and conductor 27 to coil G, from coil G by conductor28 to coil F, from coil F by conductors 30, 29 back to the generator. The energization of Gand F will, of course, cause the movementof the cores in respectively the o positeV directions.

I c aim:

1. The combination with a pair of electromavnets, ci reciprocating armatures for such magnets, a lever connecting said armatures and having a shiftin fulcrum. A

2. The combination wit a pair of solenoids, of cores for said solenoids, a lever, means forconnecting said lever and said cores, and ashifting fulcrum for said lever.

3. The combination with a pair of solenoids, of cores, a lever, links connecting the ends of the lever and the cores, and a shifting ulcrum for said lever.

4. The combination with a pair of solenoids, of cores, tools carried by said cores, a lever, means for connecting `the lever with the cores, and a shifting fulcrum for said lever,

5. The combination with a pair of solenoids, of cores, la lever, means for connecting the lever with the cores, and a pivoted device on which said lever is ulcrumed.

6. The combination with a pair of selen oids, of cores, a lever, meansI connecting the lever with the cores, ,a shifting. fulcrum for said lever, and means actuatedby the recipf rocations'of the lcores for shifting the currents in the solenoids.

7. The combination with a-fpair of solenoids, of cores a lever, means for connecting the lever wit the coresfa shifting fulcrum for the lever, and means com rising devices upon said lever for shifting the currents in said solenoids.

8'. Thehcombination with a pair of solenizo isc

oids, of cores, a lever, means for connecting the lever with the cores, a shifting fulcrum for the lever, and means for shifting the currents in the solenoids comprising a pair of elastically mounted contacts, and a pair of contacts on said lever.

9. The combination with a pair of cores, of upper and lower coils for each of said cores, a lever, means connecting the lever with the cores, a shifting fulcrum for the lever, the upper coil for each core being in circuit with the lower coil of the other core.

1U. The combination with a reciprocating, electric motor, of means for supporting the same comprising elastic supports, and means l'or pivoting the motor to said supports.

11. The combination with a reciprocating, electric motor, of means for supporting the same comprising supports, sliding devices on said supports, springs upon which said sliding devices are supported, and adjusting means against which said springs abut.

12. The combination with a reciprocating, electric motor, of means for supporting the same comprising supports, sliding devices on said supports, springs on which said sliding devices are mounted, adjustable devices against which the springs abut, and trunnions connecting the motor with the sliding devices.

13. The combination with two reciprocatabl)r mounted armatures, of a lever connecting the same having a movable fulcrum and electro magnetic means for reciprocating said armatures.

14. The combination with a reciprocating electric motor ot' adjust-able elastic supports for the saine to which the motor is pivoted.

15. The combination with a reciprocating electric motor, of side su ports for the same, movable devices on sai supports, connecting means between the motor and` the movable devices, springs sup )orting the lnovablc` devices and means l'or a justing the position of the motor relative to the supports.

CHARLES W. TRFMAIN.

Witnesses P. H. TRUMAN, H. L. PECK. 

